可控负荷备用是指在（）分钟内各级调度部门通过负荷控制系统等手段能直接调度控制的负荷。
A.10
B.20
C.30
D.60
参考答案：C
________ from what she said at the meeting, she must have lied to all of us.
A．Judged
B．Judging
C．To judge
D．Judge
风险转移的主要手段是( )。
A．分包 B．转包 C．保险 D．承包
